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Description of Business, Basis of Presentation, and Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Accounting Policies [Abstract] |  |  |
Disclosure on geographic areas, Description of revenue from external customers | revenue within Germany, which represented less than one percent of the Company's total revenue | revenue within Germany, which represented less than one percent of the Company's total revenue | revenue within Germany, which represented less than one percent of the Company's total revenue
Disclosure on geographic areas, Long-lived assets | Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company | Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company |
Minimum period in which payroll taxes are typically remitted after receipt of collections from client | 1 day |  |
Maximum period in which payroll taxes are typically remitted after receipt of collections from client | 30 days |  |
Maximum Days in Which Payroll Taxes Will Be Remitted After Receipt Of Collections From Client | 90 days |  |
Allowance for doubtful accounts | $ 1.4 | $ 1.5 |
Direct costs billed and incurred | 4,200.0 | 3,400.0 | $ 3,000.0
Maximum individual workers' compensation claims liability | 1.0 | 1.0 |
Maximum Individual Claims Liability Health Insurance | 0.3 | 0.3 |
Workers' compensation insurance costs in current liabilities | 11.3 | 8.5 |
Workers' compensation insurance costs in long-term liabilities | 15.3 | 16.0 |
PEO health insurance costs in current liabilities | 8.1 | 4.6 |
Reserve for uncertain tax positions | 29.1 | 29.8 |
Property, Plant and Equipment [Line Items] |  |  |
Goodwill | $ 561.5 | $ 540.3 |
Software Development [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |
Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Minimum [Member] | Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Minimum [Member] | Data Processing Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Minimum [Member] | Furniture Fixtures And Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Minimum [Member] | Software and Software Development Costs [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 12 years |  |
Maximum [Member] | Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 35 years |  |
Maximum [Member] | Data Processing Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 4 years |  |
Maximum [Member] | Furniture Fixtures And Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Maximum [Member] | Software and Software Development Costs [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |

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